Weed puller



April 27, 1965 F. PERHINK 3,180,429

WEED FULLER Filed April l2, 1965 4 Sheets-Sheet l fw /V f ff Kes'

( ATTORNEYS F. PERHINK WEED FULLER April 27, 1965V 4 Sheets-Sheet 2 Filed April 12, 1963 ..1.1 1 ||||||N NU WIM MUHHHUHNNH M x.

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Ftzeb www @j ATvoENEYs April 27, 1965 F. PERHlNK 3,180,429

WEED FULLER Filed April 12, 1963 4 Sheets-Sheet 4 gay S "IHg- 1Q S Se SS a l Ice m E l'l .f' 1; ,-f es w, iw

d) kl) (d) 54 43 54' INVENTOR FRED Pam-Nm BY MTTTOENEYS United States Patent O M Filed Apr. 12, 1963, Ser. No. 272,612 Claims. (Cl. 172-456) This invention relates to cultivating implements, and more particularly to an implement that pulls Weeds out of the ground and turns their roots up, exposing them to sunlight, so that the weeds are destroyed by such exposure.

A main object of the invention is to provide a novel and improved weed puller which is relatively simple in construction, Which covers a Wide working area when it is in operative position but which is foldable to a relatively compact size for transportation, and which is provided with working blade elements which are engaged below the surface of the ground during operation of the implement, acting to intercept the root systems of weeds without cutting them but operating to turn the weeds over so that their roots are exposed to the sun and so that the weeds are destroyed by such exposure, the soil beneath the operating blades being relatively undisturbed, and the action being such that any moisture in the upturned soil and Weed material is allowed to drain back into the ground.

A further object of the invention is to provide an improved weed-pulling implement which is relatively inexpensive to fabricate, which is durable in construction, which is easy to operate, and which can be readily folded to a relatively narrow width to facilitate its transportation or storage.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

FIGURE l is a top plan view of an improved Weedpulling implement constructed in accordance with the present invention, shown in unfolded operating position.

FIGURE 2 is an enlarged fragmentary top plan view of the forward central portion of the weed-pulling implement of FIGURE l.

FIGURE 3 is a vertical cross sectional view taken substantially on the line 3 3 of FIGURE 2.

FIGURE 4 is a fragmentary vertical cross sectional view taken substantially on the line 4 4 of FIGURE 1.

FIGURE 5 is an enlarged vertical cross sectional view taken substantially on the line 5 5 of FIGURE 4.

FIGURE 6 is a cross sectional detail View taken substantially on the line 6 6 of FIGURE 5.

FIGURE 7 is a fragmentary horizontal cross sectional view taken substantially on the line 7 7 of FIGURE 4.

FIGURE 8 is an enlarged fragmentary perspective view of a portion of one of the wheel elevating and lowering mechanisms employed in the weed-pulling implement of FIGURES l to 7.

FIGURE 9 is an enlarged front perspective view of the adjustable hitch assembly employed in the weed-pulling implement of FlGURES l to 8.

FIGURE l() is a fragmentary front elevational view of the weed-puling implement shown in its folded condition.

Referring to the drawings, 11 generally designates an improved weed-pulling machine constructed in accordance with the present invention. The machine 11 comprises a foldable supporting frame consisting of a main central section 12 and a plurality of auxiliary sections hinged to opposite sides of the main section 12, for example, the respective laterally extending auxiliary sections 13 and 14 dis-posed on opposite sides of the main section 12.

The main section 12 comprises the parallel front and rear channel bars 15 and 16 connected by cross bars 17 to define a generally rectangular rigid frame, which is further rigidied by the provision of diagonal brace bars lllflgg Patented Apr. 27, 1565 ICC 1S. A central longitudinally extending hitch bar 19 projects forwardly a substantial distance on the section 12. and is rigidly braced to the frame of said section by the provision of a pair of rearwardly divergent brace bars 20, 20 connected to the forward portion of the hitch bar 19 and diagonally secured on the frame section 12.

Rigidly secured to the underside of the forward portion of the hitch bar 19 is a depending vertical bar member 21 whose lower end is rigidly secured to the hitch bar 19 by an inclined strut bar 22, as shown in FIGURES 3 and 9. The front edge of the vertical bar member 21 is formed with the spaced semi-cylindrical notches 23, and slidably engaged on the bar member 21 is a hitch bracket 24 including the upper and lower longitudinally extending draw bar elements 2S, 25 which are spaced apart by a pair of vertical spacer plates 26, 26 through which extends horizontal locking pin 27, the pin 27 being removable to allow the adjustment of the bracket structure 24 vertically. The pin 27 engages in a selected notch 23 to lock the hitch bracket 24 in a desired position of vertical adjustment on the bar 21.

The forward ends of the draw bar members 25, 25 are provided with vertically aligned apertures 28, 28 to receive a hitch pin for connecting the machine to a tractor or other pulling vehicle.

The auxiliary frame sections 13 each comprises a pair of parallel channel bars 29, 29' connected by cross bars 30 and additionally braced by diagonal bars 31. 'I'he channel bars 29, 29' are hingedly connected at 32, 32' to the ends of the main frame bars 15 and 16 of section 12, the hinge axes being longitudinally aligned so that the section 13 may be folded upwardly relative to the section 12 in the manner illustrated in FIGURE l0.

The outer auxiliary frame sections 14 each comprises a pair of main channel bars 33, 33' connected by intermediate cross bars 34 and connected at their outer ends by end cross bars 35. The outer auxiliary frame sections are rigidly braced by diagonal bars 36.

Additional brace rods 37, 38 and 39 are secured respectively to the front frame bars 15, 29 and 33 in forwardly spaced relation thereto, being hingedly connected at 40 and 41 on axes aligned with the hinge axes of the connected sections.

The frame bars 33 and 33 of the outer sections 14 are hingedly connected at 42, 42 to the outer ends of the main frame bars 29, 29 of section 13, the hinge connections 42, 42 being longitudinally aligned. The rod hinge connections 40 are longitudinally aligned with the hinge connections 32, 32 and the rod hinge connections 41 are longitudinally aligned with the hinge connections 42, 42.

A supporting wheel 43 is provided at the forward end of the hitch bar 19 for at times supporting the forward end of the machine, namely, when the machine is not connected to a tractor or other pulling vehicle. Thus, a sleeve 44 is secured to one side of the forward end portion of the hitch bar 19, and extending through said sleeve is the longitudinally directed shaft portion 4S of a Wheel supporting arm 46 whose main body portion extends at right angles to the shaft portion 45. The arm 46 is provided at its free end with a lug 47 extending parallel to the shaft portion 45 on which is swiveled an axle 48 rotatably carrying the wheel 43. A locking pin 49 is engageable through the sleeve 44 and the shaft 45, said shaft being formed with intersecting bores at right angles to each other arranged to receive the locking pin 49 whereby to support the arm 46 in a raised position, wherein the wheel 43 is substantially elevated, as shown in FIG- URE 3, or in a lowered position, shown in dotted View in FIGURE 3, wherein the wheel 43 engages the ground and is constrained to support the forward portion of the machine. rThe arm 46 may be locked in its lowered position by engaging the pin 49 through the associated trans'- verse bore of shaft portion` 45. With the Wheel 43 locked i in its lowered position, the axis of its swivel connection between lug 47 Vand axle 48 is substantially vertical, so that-the wheel is free to swivel around a vertical axis and to yassume a direction corresponding to the directiony Vin which the apparatus-is being pulled, Vin the manner is a shaft member 51 extending` perpendicularly from an arm 52. Suitably connected to the free end of each arm 52 is a supporting wheel assembly 53 including a ground- Pengaging wheel 54 which is journaled on the axle 5S of the wheel assembly 53.Y The swivelling axis of the assembly Y53 is arranged so that said axis is vertical when the wheel 54 is in its lowered position, shown in dottedV viewV in FIGURE 3. In the elevated position ofthe wheel 54, shown in full Vline view in FIGURE 3, the wheel axlej 55 extends substantially .parall'eltothe frame bars v15 be engaged in the retaining lugs 70, 7 tl when the channelshaped member dit is in its vertical position, Vthus preventing the member 6) from rotating in a clockwise Vdirection, as viewed'in FIGURE 3, and thus holding the wheels 54 in their lowered positions so that they can A support the weight of the machine. Y However, when the machine is in its normal operatingy condition, the arm 69 is released so that'the wheels 54 are in their elevated positions relative to the frame of the machine, as shown in full lineview in FIGURE 3. Y

The fluid pressure cylinder 65 is connected through suitable V,flexible conduits to a Vfluid pressure supply source provided on the pulling vehicle, suitable control valves being provided to control the admission of fluid pressure into the cylinder 65.

Theauxiliary frame segments y13 and 14 are provided with swiveled caster wheel assemblies 75 and 76, the

caster wheel assemblies being swivellyconnectedrto the and 16 so that the ywheel 54- can rotate in a plane substantially parallel to the elongated central frame bar 19.

Rigidly secured to the shaft 51between the inclined, .y

supporting members 49', 49 isan upstanding arm 56 which is rigidly braced to the arm 52 by Van inclined stru-t bar `57. 1 f

The forwardly convergent frame bars 20, 20 are rigidly connected at Atheir yintermediate portion Yto the elongated centralV mainframe barv19by respective brace bars 58, 58 which are longitudinally aligned with each other and which extend parallel to the frame bar 15, as is clearly shown in FIGURE 2. Pivoted on the elongated main frame bar' 19Y adjacent the connectionsV of the brace bars 58, 58 thereto is a shortupwardly extending channel bar 60. yAsshown in FIGURE 3, the bar 60 is pivotally auxiliaryrframe segments 113 and'14 and being supported to engage the ground to support said auxiliary frame segments when the main wheels 5d are in their elevated positions relative to their associated Vframe segments 12,

as shown in full line view in FIGURE 3, namely, when the machine is ink its operating position.

Connected to and pivotally4 suspended from thermain frame bar 19, and the respective cross bar members 17,

.3d and 34 are support rods 77 which are looselyv connectedrat their bottom ends to the forward ends of plowsupporting frames 7S of generally cruciform shape. Rigidly secured to the framebars 16 are spaced pairs of lugs 79,79 to which are similarly connected suspension rods y80, 8) which areV loosely connected at their v bottom ends to the cross bars d1 of the cruciform plowsupporting 'frames 78. Coiled springs 82 surround the suspension rods 77 and Si) and exert a downward resilient biasing force on the frames 7S, biasing said frames downv wardly. Thus, the .springs 82 exert a downward biasing connected at 61ito the bar V19 for rotation on an axis v parallel to the frame bars 15 and 16. The side anges of the channel bar 6) are connected at Vtheir upper ends by respective link rods 62, 62 to the top ends of respective arms 56, 56. e l Y v 'Y Rotatably mounted on the shaft llwithin the channelshaped member 6@ is an arm 63 whose top end is pivotally connected to a piston rod 64 associated with and Y Y Each plow assembly S3 includes lan. upwardly and rearextending from Va fluid pressure cylinder65jpivoted at 66 to the framebar 19. As shown in FIGURE 3, when the piston rod 64 is extended, for example, from the full line position to its dotted line position shown in FIGURE 3, the channel-shaped member 60 vis Vrotated in a counterclockwise direction, as viewed in FIGURE 3, from its full line position to its dotted view position. This action engaging the'transverse end arm 68 of a lcatch rod 69 through a pair of apertured retaining lugs 7d, 79 provided on the web portionV of the member 60. The catch rod 69 is pivotally connected at its opposite end to the frame bar 19'by the provision of a transversely extending armV 71 thereonwhich extends rotatably through an upstanding lug 72 provided on the frame barv19, as shown' in FIGURE 8, thearm 71 being resiliently retained in the Y occurs because of the thrust exerted on the channel bar force on the arms ofthe frames 73, ,but allow said frames to swing and to undulate vertically sutiiciently to allow theiry associated plow elements to move Ypast obstructions and to adjust themselves to irregularities in the texture of the soil 4through which the plow elements are being moved'. Y Y

Secured to each of the cruciform frame members 7S and carried therebelow is a forwardlyconvergent generally V-shaped plow member .83, each plow member comprising a generally triangular point 84 and the rearwardly diverging side bars S5, 85', as Vshown in FIGURE 7.

wardly inclinedfsupporting barrti rigidlyV connected at its V7S by ya connecting plate S7, The plate 87 is formed at g its forward margin with a' plurality of spaced apertures 83 adaptedV to receive the end links of connecting chainsV 89 which connect the plates 87 to anchor loops-9i? pro- -1 vided on the forward frame bar 15, as shown in FIG- be lockt-.diri its Y membersl 94, i3-and 92, allowing relative verticalmove- Y lug 72 by the'provision of a coiled spring 73 which sur-, l

rounds the arm '71 and bears between 1ug'72 and a re-Y Y taining washer 74 fastenedonrthe end Vof the arm 71.

As will be Vreadily apparent, the holding a'rmf 68 'may UREZ.l The chains 89 prevent excessive side sway or deviation of thefplow members 83. Y Y

Pivotally connected at 91 to the rear Aend portions of the main arms of the crucifo'rm frame members 78 are respectivelever arms 92the ends'of the lever armsl being linked together Vby link rods 93, the endmost link rods 93 being connected to short lever arms 94 pivotedV at 95 to the'endmost plow-supporting frame members 78. Y Thus, the plow-supporting frames are linked together at their rear end portions by the continuous linkage defined by the ments of` theplow-supporting frames but controlling the movements of said framesin accordance with the degrees of freedom permitted yby therconnecting linkage. The free Vmovement of the plow-'supporting frames is further limited by their connections to the mainframe of the machine/throughV the suspension rods 77 and`80. VThe outer frame sections 14 are provided adjacent their hinged connections 42, 42 with a cross bar 94 on which is rigidly secured an upstanding channel bar 95. The frame sections 13 are likewise provided adjacent their hinged connections 32, 32' with cross bars 96 on which are rigidly secured opstanding channel bars 97. The diagonal brace bar members 2G have rigidly secured thereon upstanding channel bars 98, the channel bars 95, 97 and 98 being substantially in alignment with each other, as shown in FIGURE 1. The innermost pair of upstanding channel bars 98, 98 are rigidly connected together at their top ends by a connecting bar 99. Respective iluid pressure cylinders 106 are pivotally connected at lill to the upstanding channel bars 93, being directed outwardly and being provided with pistons having outwardly extending piston rods 102. The piston rods 102 terminate adjacent the upstanding channel bars 97 and are connected by transverse pins 104 to link bars 195 which are in turn pivotally connected at 106 to lugs provided on the lower portions of the channel bars 97. Also pivotally connected to the ends of the piston rods 1tl2 at the 4transverse connecting pins 104 are the ends of additional link rods 106 which extend slidably through vertical slots 107 prow'ded in the channel bars 97 and are pivotally connected at their outer ends to the top ends of the respective upstanding channel bars 95. Stop collars 16S are adjustably mounted on the link bars 166 to limit the inward movement of the link bars 106 relative to the channel bars 97, providing positive abutment of the collar members 103 with said channel bars 97 after the link bars 106 have been retracted by a predetermined amount responsive to the retraction of the piston rods 102 in the uid pressure cylinders 100. Thus, when the piston rods 102 are retracted in the cylinders 160, the end sections 14 are tirst elevated, for example, to the dotted View positions thereof illustrated in FIGURE 4, after which the collars 108 abut the upstanding channel bars 97 and in turn cause the next inner frame sections 13 to be elevated with continued retraction of the piston rods 102. Thus, eventually the frame sections 14 and 13 will be elevated to the positions thereof shown in FIGURE l0, wherein frame sections 13 are substantially vertical and the frame sections 14 are substantially horizontal and are parallel with and overlie the central main frame section 12.

The Huid pressure cylinders 100 are energized from the iiuid pressure source provided on the pulling vehicle through suitable control valves, as in the case of the fluid pressure cylinder 65.

In operation, the piston rods 102 are fully extended and the wheels 54 are elevated to their full line positions shown in FIGURES 2 and 3, whereby the V-shaped plow assemblies 83 are allowed to penetrate beneath the surface of the ground as the machine is pulled forwardly by the pulling vehicle. The machine is of substantial width, for example, of the order of 60 feet in width, and the V-shaped plow members 83 move several inches below the surface of the soil, for example, penetrate to a depth of the order of four inches below the soil surface. The plow members intercept the root systems of weeds, and do not cut the weeds but turn them over so that the root systems are exposed to the sun and air and are thus rapidly destroyed. In this process there is no substantial disturbance of the moisture in the soil nor is the compactness of the soil beneath the plow members materially disturbed. Since the body portions of the weeds are merely inverted when the roots are thus exposed, the moisture in the Weeds is allowed to drain back into the soil, so that there is no substantial loss of moisture by the weed-pulling operation of the machine.

When the machine is to be prepared for transportation or storage, the wheels 54 are lowered by action of the uid pressure cylinder 65 to the dotted view positions thereof, shown in FIGURE 3, which elevates the apparatus. The forward wheel 43 may then be lowered to the dotted view position thereof shown in FIGURE 3 and locked in this lowered position by means of its locking piu 49. The wheel 43 is thus in a position to provide forward support for the machine when it is being towed or allowed to be independently supported. TheV outer frame sections are then elevated by operating the uid pressure cylinders 100, whereby the frame sections 13 and 14 are raised to the positions illustrated in FIG- URE 10.

It will be noted that with the outer sections 13 and 14 elevated, as shown in FIGURE l0, the over-al1 width of the machine is considerably reduced, and that furthermore the supporting wheels under these conditions comprise the wheels 43 and 54. As previously mentioned, the wheel assemblies associated with the wheels 43 and 54 are swivelled so as to turn freely on vertical axes when the asemblies are in the positions illustrated in FIG- URE 10. The machine may therefore be towed laterally, namely, may be moved in the direction parallel to the frame bars 15 and 16, allowing it to be moved over an ordinary highway or other thoroughfare of standard width.

As will be readily apparent, when the lluid pressure cylinder is operated to extend its piston rod and thereby cause the channel-shaped arm 60 to be rotated from the full line position of FIGURE 3 to the dotted view position thereof, whereby to lower the wheels 54, 4the member 60 may be locked in its vertical dotted view position of FIGURE 3 by means of the locking rod 69, as previously described.

As above mentioned, the machine is designed to cover a very wide working area, for example, an area up to 60 feet wide or more, but is foldable by the uid pressureoperated means above described to a width of the order of 15 feet for towing. As will be apparent from FIG- URE 7, the plow assemblies 83 are of sutlicient width so that they completely traverse the area being worked, the rearwardly extending side bar elements S5, 85', of the plow members overlapping each other at their ends, as shown in FIGURE 7, so as to insure complete and continuous soil working over the area traversed by the machine. For this reason, one side arm 85 is preferably somewhat longer than the other side arm 85', as illustrated in FIGURE 7, so that the shorter side arm will terminate forwardly of the rear end of the longer side arm of the adjacent plow assembly. Therefore, by making one side arm 85, SS shorter than the opposite side arm, the plow assemblies may be all mounted in the same plane and spaced sufficiently close together to insure overlapping soil working of adjacent plow assemblies.

The machine operates on hilly or rolling land as well as it does on level land. Rocky land does not create any serious hazards or difficulties in operation.

While a specific embodiment of an improved weed pulling implement has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention except as defined by the scope of the appended claims.

What is claimed is:

1. A weed-pulling implement comprising a main horizontal frame segment, hitch means on said main frame segment adapted to be connected to a pulling vehicle, a plurality of vertically adjustable supporting wheel assemblies on said main frame segment, additional frame segments hingedly connected to opposite ends of said main frame segment and being foldable upwardly relative to said main frame segment, fluid pressure-operated means connecting the additional frame segments to the main frame segment for at times elevating said additional frame segments, forwardly convergent generally V-shaped plow members provided with cruciform supporting frame structures rigidly secured to and overlying and extending substantially parallel to the plow members, means swingably connecting the forward and lateral ends of the crucform frame structures to the frame segments, whereby tol swingably support -the plow members from the frame segments f sub'star'itially'parallel thereto and. normally being below ground level when the frame segments are horizontal, fluid pressure-operatedv meansV for lowering'said wheel assemlies to )elevate said plow members above ground level,

' additional-supporting wheel assemblies swivellyconnected tosaid additional frame assemblies, and'linkage means interconnecting' the'rear ends Yof' said cruciform frame structures and extending substantially parallel Vto said frame segments. Y i Y 2. A foldable weed-pulling implement comprising a main horizontal trame segment, hitch means on said main frame segment adapted to be connected to'a pulling Vehi- Y cle, a plurality of vertically adjustable Vdepending swivelled supporting wheel assemblies on said main frame segment,

additional frame segments hingedly connected to opposite ends of saidimain frame segment and being foldable upwardly relative torsaid main frame segment, forwardly convergent generallyV-shaped plowmembers provided with cruciform supporting frame structures rigidly secured to and overlying and extending substantially parallel to the plow members, means swingably connecting the forward and lateral ends 'of the cruciform lfrarnestructures to the frame segments,` whereby to swingably support the plow Y members vfrom the frame segments and spring means biasing the cruciform supporting frame structures downwardly toward'positions substantially parallel to the frame segments. Y

' 3. A foldable weed-pulling implement comprising a main horizontal frame segment, hitch means on said main frame segmentadapted to be connected to a pulling vehicle, a plurality of vertically adjustable depending swivelled supporting wheel assemblies on said main frame segment, additional frame segments hingedly connected to opposite ends of said main frame segment and'being foldableupwardly relative to,said main frame segment,

forwardly convergent generally V-shaped plow members. provided vwith cruciiforni supporting. frame Astructures rigidly secured to andoverlying and extending substan-V cle, a pluralityv of verticallyadiustsble depending swivelled supporting wheel assemblies on said main frame segment, additional frame segments hingedlyrconnectedto opposite ends Vof said main framesegment and being foldablre upwardlyrelative to said main frame segment, forwardly convergent generally V-shaped'plow members provided with cruciforrn supporting frame structures rigidly secured s to andV overlying and extending substantially parallel to the plow members, means swingably connectingthe forward and lateral ends of the crucitorm frame structures to the Vframe segments, whereby to swingably support the plow members from the frame segments, spring means biasing the cruciform supporting frame structures down-k frame segment adapted to bev connected' to apulling'vehi-g cle, a plurality of vertically adjustable depending swivelled supporting wheel assemblies on said main frame segment,- additional frame segments hingedly connected to opposite ends of said main frame segment and being foldable up-v wardly relative 'to said main trame segment, forwardly convergent generally V-shaped plow `membersprovided with cruciform supporting frame` structures Vrigidly secured to'andoverlying and extending substantially par-y allel to the plow membersgmeansswingably connecting 4the forward and lateral ends of the cruciform frame Structures to the frame segments,V whereby to swingably support'the plow members fromV theframe segments, spring `means biasing the cruciform supportingV frame Structures downwardly toward lpositions substantially parallel tothe frame segments, linkage means interconnecting the rear tially` parallel vto t'ne plow members, means swingably Y connecting the forward Vand lateral ends ofthe cruciform Y Y frame structures tothe frame segments, whereby to swngf ably support the plow members from the frame segments, spring means Y biasing the cruciform supporting' frame structures downwardly toward positions substantially parallel to the frame'segments',and linkage means interconnecting the rear ends `of the cruciform supporting frame v structures and extending substantially parallel to the frame segments. i

4. A foldable weed-pulling implement comprising a main horizontal frame segment, hitch means on saidmain frame segment adapted to be connected to a pulling vehi- Vends of the crucitorm supporting trame structures'and exvtending substantiallyparallel to the frame segments, liluid'r pressure-operated means for lowering said supportingl wheel assemblies relative to said main frame Segmennand additionaldepending supporting wheel assemblies swivelly connected to the additional frame segments. L 'K References Cited by 'the Examiner l UNITED srA'rns PATENTS Y 1,444,572 2/23 Thomason g.' 172-,658 Y Veusse 6/53 Grahamv 172-413xn 2,985,248 5/61 Richardson 172-619 3,003,789

lil/6l Calliins 172-456 XR T. GRAHAM CnAvER, Primaryv Examiner., 

5. A FOLDABLE WEED-PULLING IMPLEMENT COMPRISING A MAIN HORIZONTAL FRAME SEGMENT, HITCH MEANS ON SAID MAIN FRAME SEGMENT ADAPTED TO BE CONNECTED TO A PULLING VEHICLE, A PLURALITY OF VERTICALLY ADJUSTABLE DEPENDING SWIVELLED SUPPORTING WHEEL ASSEMBLIES ON SAID MAIN FRAME SEGMENT, ADDITIONAL FRAME SEGMENTS HINGEDLY CONNECTED TO OPPOSITE ENDS OF SAID MAIN FRAME SEGMENT AND BEING FOLDABLE UPWARDLY RELATIVE TO SAID MAIN FRAME SEGMENT, FORWARDLY CONVERGENT GENERALLY V-SHAPED PLOW MEMBERS PROVIDED WITH CRUCIFORM SUPPORTING FRAME STRUCTURES RIGIDLY SECURED TO AND OVERLYING AND EXTENDING SUBSTANTIALLY PARALLEL TO THE PLOW MEMBERS, MEANS SWINGABLY CONNECTING THE FORWARD AND LATERAL ENDS OF THE CRUCIFORM FRAME STRUC- 